div> .yewei{
  display: flex;
   padding: 0 500px 0 500px ;
   text-align: center
 }
 div .ym{
  display: flex;
 justify-content: content;
}
div .weiba{
  width: 400px;
  height: 180px;
  border: 1px solid black;
  margin: auto;
 
}
div >h3{
  color: aquamarine;
  display: flex;
  justify-content: center;
}
div.pp{
  display: flex;
}
div.liubai{
  height: 100px;
  background-color: white;
}